Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * TUN - Universal TUN/TAP device driver. | |
3 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Changes: | |
20 | * | |
ff4cc3ac MK |
21 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
22 | * Add TUNSETLINK ioctl to set the link encapsulation | |
23 | * | |
1da177e4 | 24 | * Mark Smith <markzzzsmith@yahoo.com.au> |
f271b2cc | 25 | * Use random_ether_addr() for tap MAC address. |
1da177e4 LT |
26 | * |
27 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
28 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
29 | * Increased default tx queue length. | |
30 | * Added ethtool API. | |
31 | * Minor cleanups | |
32 | * | |
33 | * Daniel Podlejski <underley@underley.eu.org> | |
34 | * Modifications for 2.3.99-pre5 kernel. | |
35 | */ | |
36 | ||
37 | #define DRV_NAME "tun" | |
38 | #define DRV_VERSION "1.6" | |
39 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
40 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
41 | ||
1da177e4 LT |
42 | #include <linux/module.h> |
43 | #include <linux/errno.h> | |
44 | #include <linux/kernel.h> | |
45 | #include <linux/major.h> | |
46 | #include <linux/slab.h> | |
fd3e05b6 | 47 | #include <linux/smp_lock.h> |
1da177e4 LT |
48 | #include <linux/poll.h> |
49 | #include <linux/fcntl.h> | |
50 | #include <linux/init.h> | |
51 | #include <linux/skbuff.h> | |
52 | #include <linux/netdevice.h> | |
53 | #include <linux/etherdevice.h> | |
54 | #include <linux/miscdevice.h> | |
55 | #include <linux/ethtool.h> | |
56 | #include <linux/rtnetlink.h> | |
57 | #include <linux/if.h> | |
58 | #include <linux/if_arp.h> | |
59 | #include <linux/if_ether.h> | |
60 | #include <linux/if_tun.h> | |
61 | #include <linux/crc32.h> | |
d647a591 | 62 | #include <linux/nsproxy.h> |
f43798c2 | 63 | #include <linux/virtio_net.h> |
881d966b | 64 | #include <net/net_namespace.h> |
79d17604 | 65 | #include <net/netns/generic.h> |
f019a7a5 | 66 | #include <net/rtnetlink.h> |
33dccbb0 | 67 | #include <net/sock.h> |
1da177e4 LT |
68 | |
69 | #include <asm/system.h> | |
70 | #include <asm/uaccess.h> | |
71 | ||
14daa021 RR |
72 | /* Uncomment to enable debugging */ |
73 | /* #define TUN_DEBUG 1 */ | |
74 | ||
1da177e4 LT |
75 | #ifdef TUN_DEBUG |
76 | static int debug; | |
14daa021 RR |
77 | |
78 | #define DBG if(tun->debug)printk | |
79 | #define DBG1 if(debug==2)printk | |
80 | #else | |
81 | #define DBG( a... ) | |
82 | #define DBG1( a... ) | |
83 | #endif | |
84 | ||
f271b2cc MK |
85 | #define FLT_EXACT_COUNT 8 |
86 | struct tap_filter { | |
87 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
88 | u32 mask[2]; /* Mask of the hashed addrs */ | |
89 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
90 | }; | |
91 | ||
631ab46b | 92 | struct tun_file { |
c70f1829 | 93 | atomic_t count; |
631ab46b | 94 | struct tun_struct *tun; |
36b50bab | 95 | struct net *net; |
631ab46b EB |
96 | }; |
97 | ||
33dccbb0 HX |
98 | struct tun_sock; |
99 | ||
14daa021 | 100 | struct tun_struct { |
631ab46b | 101 | struct tun_file *tfile; |
f271b2cc | 102 | unsigned int flags; |
14daa021 RR |
103 | uid_t owner; |
104 | gid_t group; | |
105 | ||
14daa021 RR |
106 | struct sk_buff_head readq; |
107 | ||
108 | struct net_device *dev; | |
f271b2cc | 109 | struct fasync_struct *fasync; |
14daa021 | 110 | |
f271b2cc | 111 | struct tap_filter txflt; |
33dccbb0 HX |
112 | struct sock *sk; |
113 | struct socket socket; | |
14daa021 RR |
114 | |
115 | #ifdef TUN_DEBUG | |
116 | int debug; | |
1da177e4 | 117 | #endif |
14daa021 | 118 | }; |
1da177e4 | 119 | |
33dccbb0 HX |
120 | struct tun_sock { |
121 | struct sock sk; | |
122 | struct tun_struct *tun; | |
123 | }; | |
124 | ||
125 | static inline struct tun_sock *tun_sk(struct sock *sk) | |
126 | { | |
127 | return container_of(sk, struct tun_sock, sk); | |
128 | } | |
129 | ||
a7385ba2 EB |
130 | static int tun_attach(struct tun_struct *tun, struct file *file) |
131 | { | |
631ab46b | 132 | struct tun_file *tfile = file->private_data; |
a7385ba2 | 133 | const struct cred *cred = current_cred(); |
38231b7a | 134 | int err; |
a7385ba2 EB |
135 | |
136 | ASSERT_RTNL(); | |
137 | ||
a7385ba2 EB |
138 | /* Check permissions */ |
139 | if (((tun->owner != -1 && cred->euid != tun->owner) || | |
1bded710 | 140 | (tun->group != -1 && !in_egroup_p(tun->group))) && |
a7385ba2 EB |
141 | !capable(CAP_NET_ADMIN)) |
142 | return -EPERM; | |
143 | ||
38231b7a EB |
144 | netif_tx_lock_bh(tun->dev); |
145 | ||
146 | err = -EINVAL; | |
147 | if (tfile->tun) | |
148 | goto out; | |
149 | ||
150 | err = -EBUSY; | |
151 | if (tun->tfile) | |
152 | goto out; | |
153 | ||
154 | err = 0; | |
631ab46b EB |
155 | tfile->tun = tun; |
156 | tun->tfile = tfile; | |
c70f1829 | 157 | dev_hold(tun->dev); |
9c3fea6a | 158 | sock_hold(tun->sk); |
c70f1829 | 159 | atomic_inc(&tfile->count); |
a7385ba2 | 160 | |
38231b7a EB |
161 | out: |
162 | netif_tx_unlock_bh(tun->dev); | |
163 | return err; | |
a7385ba2 EB |
164 | } |
165 | ||
631ab46b EB |
166 | static void __tun_detach(struct tun_struct *tun) |
167 | { | |
631ab46b | 168 | /* Detach from net device */ |
38231b7a | 169 | netif_tx_lock_bh(tun->dev); |
631ab46b | 170 | tun->tfile = NULL; |
38231b7a | 171 | netif_tx_unlock_bh(tun->dev); |
631ab46b EB |
172 | |
173 | /* Drop read queue */ | |
174 | skb_queue_purge(&tun->readq); | |
c70f1829 EB |
175 | |
176 | /* Drop the extra count on the net device */ | |
177 | dev_put(tun->dev); | |
178 | } | |
179 | ||
180 | static void tun_detach(struct tun_struct *tun) | |
181 | { | |
182 | rtnl_lock(); | |
183 | __tun_detach(tun); | |
184 | rtnl_unlock(); | |
631ab46b EB |
185 | } |
186 | ||
187 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
188 | { | |
c70f1829 EB |
189 | struct tun_struct *tun = NULL; |
190 | ||
191 | if (atomic_inc_not_zero(&tfile->count)) | |
192 | tun = tfile->tun; | |
193 | ||
194 | return tun; | |
631ab46b EB |
195 | } |
196 | ||
197 | static struct tun_struct *tun_get(struct file *file) | |
198 | { | |
199 | return __tun_get(file->private_data); | |
200 | } | |
201 | ||
202 | static void tun_put(struct tun_struct *tun) | |
203 | { | |
c70f1829 EB |
204 | struct tun_file *tfile = tun->tfile; |
205 | ||
206 | if (atomic_dec_and_test(&tfile->count)) | |
207 | tun_detach(tfile->tun); | |
631ab46b EB |
208 | } |
209 | ||
f271b2cc MK |
210 | /* TAP filterting */ |
211 | static void addr_hash_set(u32 *mask, const u8 *addr) | |
212 | { | |
213 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
214 | mask[n >> 5] |= (1 << (n & 31)); | |
215 | } | |
216 | ||
217 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
218 | { | |
219 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
220 | return mask[n >> 5] & (1 << (n & 31)); | |
221 | } | |
222 | ||
223 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
224 | { | |
225 | struct { u8 u[ETH_ALEN]; } *addr; | |
226 | struct tun_filter uf; | |
227 | int err, alen, n, nexact; | |
228 | ||
229 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
230 | return -EFAULT; | |
231 | ||
232 | if (!uf.count) { | |
233 | /* Disabled */ | |
234 | filter->count = 0; | |
235 | return 0; | |
236 | } | |
237 | ||
238 | alen = ETH_ALEN * uf.count; | |
239 | addr = kmalloc(alen, GFP_KERNEL); | |
240 | if (!addr) | |
241 | return -ENOMEM; | |
242 | ||
243 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
244 | err = -EFAULT; | |
245 | goto done; | |
246 | } | |
247 | ||
248 | /* The filter is updated without holding any locks. Which is | |
249 | * perfectly safe. We disable it first and in the worst | |
250 | * case we'll accept a few undesired packets. */ | |
251 | filter->count = 0; | |
252 | wmb(); | |
253 | ||
254 | /* Use first set of addresses as an exact filter */ | |
255 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
256 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
257 | ||
258 | nexact = n; | |
259 | ||
cfbf84fc AW |
260 | /* Remaining multicast addresses are hashed, |
261 | * unicast will leave the filter disabled. */ | |
f271b2cc | 262 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
263 | for (; n < uf.count; n++) { |
264 | if (!is_multicast_ether_addr(addr[n].u)) { | |
265 | err = 0; /* no filter */ | |
266 | goto done; | |
267 | } | |
f271b2cc | 268 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 269 | } |
f271b2cc MK |
270 | |
271 | /* For ALLMULTI just set the mask to all ones. | |
272 | * This overrides the mask populated above. */ | |
273 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
274 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
275 | ||
276 | /* Now enable the filter */ | |
277 | wmb(); | |
278 | filter->count = nexact; | |
279 | ||
280 | /* Return the number of exact filters */ | |
281 | err = nexact; | |
282 | ||
283 | done: | |
284 | kfree(addr); | |
285 | return err; | |
286 | } | |
287 | ||
288 | /* Returns: 0 - drop, !=0 - accept */ | |
289 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
290 | { | |
291 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
292 | * at this point. */ | |
293 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
294 | int i; | |
295 | ||
296 | /* Exact match */ | |
297 | for (i = 0; i < filter->count; i++) | |
298 | if (!compare_ether_addr(eh->h_dest, filter->addr[i])) | |
299 | return 1; | |
300 | ||
301 | /* Inexact match (multicast only) */ | |
302 | if (is_multicast_ether_addr(eh->h_dest)) | |
303 | return addr_hash_test(filter->mask, eh->h_dest); | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | /* | |
309 | * Checks whether the packet is accepted or not. | |
310 | * Returns: 0 - drop, !=0 - accept | |
311 | */ | |
312 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
313 | { | |
314 | if (!filter->count) | |
315 | return 1; | |
316 | ||
317 | return run_filter(filter, skb); | |
318 | } | |
319 | ||
1da177e4 LT |
320 | /* Network device part of the driver */ |
321 | ||
7282d491 | 322 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 323 | |
c70f1829 EB |
324 | /* Net device detach from fd. */ |
325 | static void tun_net_uninit(struct net_device *dev) | |
326 | { | |
327 | struct tun_struct *tun = netdev_priv(dev); | |
328 | struct tun_file *tfile = tun->tfile; | |
329 | ||
330 | /* Inform the methods they need to stop using the dev. | |
331 | */ | |
332 | if (tfile) { | |
c40af84a | 333 | wake_up_all(&tun->socket.wait); |
c70f1829 EB |
334 | if (atomic_dec_and_test(&tfile->count)) |
335 | __tun_detach(tun); | |
336 | } | |
337 | } | |
338 | ||
9c3fea6a HX |
339 | static void tun_free_netdev(struct net_device *dev) |
340 | { | |
341 | struct tun_struct *tun = netdev_priv(dev); | |
342 | ||
343 | sock_put(tun->sk); | |
344 | } | |
345 | ||
1da177e4 LT |
346 | /* Net device open. */ |
347 | static int tun_net_open(struct net_device *dev) | |
348 | { | |
349 | netif_start_queue(dev); | |
350 | return 0; | |
351 | } | |
352 | ||
353 | /* Net device close. */ | |
354 | static int tun_net_close(struct net_device *dev) | |
355 | { | |
356 | netif_stop_queue(dev); | |
357 | return 0; | |
358 | } | |
359 | ||
360 | /* Net device start xmit */ | |
361 | static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
362 | { | |
363 | struct tun_struct *tun = netdev_priv(dev); | |
364 | ||
365 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
366 | ||
367 | /* Drop packet if interface is not attached */ | |
631ab46b | 368 | if (!tun->tfile) |
1da177e4 LT |
369 | goto drop; |
370 | ||
f271b2cc MK |
371 | /* Drop if the filter does not like it. |
372 | * This is a noop if the filter is disabled. | |
373 | * Filter can be enabled only for the TAP devices. */ | |
374 | if (!check_filter(&tun->txflt, skb)) | |
375 | goto drop; | |
376 | ||
1da177e4 LT |
377 | if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { |
378 | if (!(tun->flags & TUN_ONE_QUEUE)) { | |
379 | /* Normal queueing mode. */ | |
380 | /* Packet scheduler handles dropping of further packets. */ | |
381 | netif_stop_queue(dev); | |
382 | ||
383 | /* We won't see all dropped packets individually, so overrun | |
384 | * error is more appropriate. */ | |
09f75cd7 | 385 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
386 | } else { |
387 | /* Single queue mode. | |
388 | * Driver handles dropping of all packets itself. */ | |
389 | goto drop; | |
390 | } | |
391 | } | |
392 | ||
f271b2cc | 393 | /* Enqueue packet */ |
1da177e4 LT |
394 | skb_queue_tail(&tun->readq, skb); |
395 | dev->trans_start = jiffies; | |
396 | ||
397 | /* Notify and wake up reader process */ | |
398 | if (tun->flags & TUN_FASYNC) | |
399 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
c40af84a | 400 | wake_up_interruptible(&tun->socket.wait); |
1da177e4 LT |
401 | return 0; |
402 | ||
403 | drop: | |
09f75cd7 | 404 | dev->stats.tx_dropped++; |
1da177e4 LT |
405 | kfree_skb(skb); |
406 | return 0; | |
407 | } | |
408 | ||
f271b2cc | 409 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 410 | { |
f271b2cc MK |
411 | /* |
412 | * This callback is supposed to deal with mc filter in | |
413 | * _rx_ path and has nothing to do with the _tx_ path. | |
414 | * In rx path we always accept everything userspace gives us. | |
415 | */ | |
416 | return; | |
1da177e4 LT |
417 | } |
418 | ||
4885a504 ES |
419 | #define MIN_MTU 68 |
420 | #define MAX_MTU 65535 | |
421 | ||
422 | static int | |
423 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
424 | { | |
425 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
426 | return -EINVAL; | |
427 | dev->mtu = new_mtu; | |
428 | return 0; | |
429 | } | |
430 | ||
758e43b7 | 431 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 432 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
433 | .ndo_open = tun_net_open, |
434 | .ndo_stop = tun_net_close, | |
00829823 | 435 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 436 | .ndo_change_mtu = tun_net_change_mtu, |
758e43b7 SH |
437 | }; |
438 | ||
439 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 440 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
441 | .ndo_open = tun_net_open, |
442 | .ndo_stop = tun_net_close, | |
00829823 | 443 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 SH |
444 | .ndo_change_mtu = tun_net_change_mtu, |
445 | .ndo_set_multicast_list = tun_net_mclist, | |
446 | .ndo_set_mac_address = eth_mac_addr, | |
447 | .ndo_validate_addr = eth_validate_addr, | |
448 | }; | |
449 | ||
1da177e4 LT |
450 | /* Initialize net device. */ |
451 | static void tun_net_init(struct net_device *dev) | |
452 | { | |
453 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 454 | |
1da177e4 LT |
455 | switch (tun->flags & TUN_TYPE_MASK) { |
456 | case TUN_TUN_DEV: | |
758e43b7 SH |
457 | dev->netdev_ops = &tun_netdev_ops; |
458 | ||
1da177e4 LT |
459 | /* Point-to-Point TUN Device */ |
460 | dev->hard_header_len = 0; | |
461 | dev->addr_len = 0; | |
462 | dev->mtu = 1500; | |
463 | ||
464 | /* Zero header length */ | |
6aa20a22 | 465 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
466 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
467 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
468 | break; | |
469 | ||
470 | case TUN_TAP_DEV: | |
7a0a9608 | 471 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 472 | /* Ethernet TAP Device */ |
1da177e4 | 473 | ether_setup(dev); |
36226a8d | 474 | |
f271b2cc | 475 | random_ether_addr(dev->dev_addr); |
36226a8d | 476 | |
1da177e4 LT |
477 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
478 | break; | |
479 | } | |
480 | } | |
481 | ||
482 | /* Character device part */ | |
483 | ||
484 | /* Poll */ | |
485 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 486 | { |
b2430de3 EB |
487 | struct tun_file *tfile = file->private_data; |
488 | struct tun_struct *tun = __tun_get(tfile); | |
33dccbb0 HX |
489 | struct sock *sk = tun->sk; |
490 | unsigned int mask = 0; | |
1da177e4 LT |
491 | |
492 | if (!tun) | |
eac9e902 | 493 | return POLLERR; |
1da177e4 LT |
494 | |
495 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); | |
496 | ||
c40af84a | 497 | poll_wait(file, &tun->socket.wait, wait); |
6aa20a22 | 498 | |
b03efcfb | 499 | if (!skb_queue_empty(&tun->readq)) |
1da177e4 LT |
500 | mask |= POLLIN | POLLRDNORM; |
501 | ||
33dccbb0 HX |
502 | if (sock_writeable(sk) || |
503 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
504 | sock_writeable(sk))) | |
505 | mask |= POLLOUT | POLLWRNORM; | |
506 | ||
c70f1829 EB |
507 | if (tun->dev->reg_state != NETREG_REGISTERED) |
508 | mask = POLLERR; | |
509 | ||
631ab46b | 510 | tun_put(tun); |
1da177e4 LT |
511 | return mask; |
512 | } | |
513 | ||
f42157cb RR |
514 | /* prepad is the amount to reserve at front. len is length after that. |
515 | * linear is a hint as to how much to copy (usually headers). */ | |
33dccbb0 HX |
516 | static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun, |
517 | size_t prepad, size_t len, | |
518 | size_t linear, int noblock) | |
f42157cb | 519 | { |
33dccbb0 | 520 | struct sock *sk = tun->sk; |
f42157cb | 521 | struct sk_buff *skb; |
33dccbb0 | 522 | int err; |
f42157cb RR |
523 | |
524 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 525 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 526 | linear = len; |
f42157cb | 527 | |
33dccbb0 HX |
528 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
529 | &err); | |
f42157cb | 530 | if (!skb) |
33dccbb0 | 531 | return ERR_PTR(err); |
f42157cb RR |
532 | |
533 | skb_reserve(skb, prepad); | |
534 | skb_put(skb, linear); | |
33dccbb0 HX |
535 | skb->data_len = len - linear; |
536 | skb->len += len - linear; | |
f42157cb RR |
537 | |
538 | return skb; | |
539 | } | |
540 | ||
1da177e4 | 541 | /* Get packet from user space buffer */ |
33dccbb0 | 542 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, |
6f26c9a7 | 543 | const struct iovec *iv, size_t count, |
33dccbb0 | 544 | int noblock) |
1da177e4 | 545 | { |
09640e63 | 546 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 LT |
547 | struct sk_buff *skb; |
548 | size_t len = count, align = 0; | |
f43798c2 | 549 | struct virtio_net_hdr gso = { 0 }; |
6f26c9a7 | 550 | int offset = 0; |
1da177e4 LT |
551 | |
552 | if (!(tun->flags & TUN_NO_PI)) { | |
553 | if ((len -= sizeof(pi)) > count) | |
554 | return -EINVAL; | |
555 | ||
6f26c9a7 | 556 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 557 | return -EFAULT; |
6f26c9a7 | 558 | offset += sizeof(pi); |
1da177e4 LT |
559 | } |
560 | ||
f43798c2 RR |
561 | if (tun->flags & TUN_VNET_HDR) { |
562 | if ((len -= sizeof(gso)) > count) | |
563 | return -EINVAL; | |
564 | ||
6f26c9a7 | 565 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
566 | return -EFAULT; |
567 | ||
568 | if (gso.hdr_len > len) | |
569 | return -EINVAL; | |
6f26c9a7 | 570 | offset += sizeof(pi); |
f43798c2 RR |
571 | } |
572 | ||
e01bf1c8 | 573 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
1da177e4 | 574 | align = NET_IP_ALIGN; |
0eca93bc HX |
575 | if (unlikely(len < ETH_HLEN || |
576 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
577 | return -EINVAL; |
578 | } | |
6aa20a22 | 579 | |
33dccbb0 HX |
580 | skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock); |
581 | if (IS_ERR(skb)) { | |
582 | if (PTR_ERR(skb) != -EAGAIN) | |
583 | tun->dev->stats.rx_dropped++; | |
584 | return PTR_ERR(skb); | |
1da177e4 LT |
585 | } |
586 | ||
6f26c9a7 | 587 | if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) { |
09f75cd7 | 588 | tun->dev->stats.rx_dropped++; |
8f22757e | 589 | kfree_skb(skb); |
1da177e4 | 590 | return -EFAULT; |
8f22757e | 591 | } |
1da177e4 | 592 | |
f43798c2 RR |
593 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
594 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
595 | gso.csum_offset)) { | |
596 | tun->dev->stats.rx_frame_errors++; | |
597 | kfree_skb(skb); | |
598 | return -EINVAL; | |
599 | } | |
600 | } else if (tun->flags & TUN_NOCHECKSUM) | |
601 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
602 | ||
1da177e4 LT |
603 | switch (tun->flags & TUN_TYPE_MASK) { |
604 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
605 | if (tun->flags & TUN_NO_PI) { |
606 | switch (skb->data[0] & 0xf0) { | |
607 | case 0x40: | |
608 | pi.proto = htons(ETH_P_IP); | |
609 | break; | |
610 | case 0x60: | |
611 | pi.proto = htons(ETH_P_IPV6); | |
612 | break; | |
613 | default: | |
614 | tun->dev->stats.rx_dropped++; | |
615 | kfree_skb(skb); | |
616 | return -EINVAL; | |
617 | } | |
618 | } | |
619 | ||
459a98ed | 620 | skb_reset_mac_header(skb); |
1da177e4 | 621 | skb->protocol = pi.proto; |
4c13eb66 | 622 | skb->dev = tun->dev; |
1da177e4 LT |
623 | break; |
624 | case TUN_TAP_DEV: | |
625 | skb->protocol = eth_type_trans(skb, tun->dev); | |
626 | break; | |
627 | }; | |
628 | ||
f43798c2 RR |
629 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
630 | pr_debug("GSO!\n"); | |
631 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
632 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
633 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
634 | break; | |
635 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
636 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
637 | break; | |
638 | default: | |
639 | tun->dev->stats.rx_frame_errors++; | |
640 | kfree_skb(skb); | |
641 | return -EINVAL; | |
642 | } | |
643 | ||
644 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
645 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
646 | ||
647 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
648 | if (skb_shinfo(skb)->gso_size == 0) { | |
649 | tun->dev->stats.rx_frame_errors++; | |
650 | kfree_skb(skb); | |
651 | return -EINVAL; | |
652 | } | |
653 | ||
654 | /* Header must be checked, and gso_segs computed. */ | |
655 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
656 | skb_shinfo(skb)->gso_segs = 0; | |
657 | } | |
6aa20a22 | 658 | |
1da177e4 | 659 | netif_rx_ni(skb); |
6aa20a22 | 660 | |
09f75cd7 JG |
661 | tun->dev->stats.rx_packets++; |
662 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
663 | |
664 | return count; | |
6aa20a22 | 665 | } |
1da177e4 | 666 | |
ee0b3e67 BP |
667 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
668 | unsigned long count, loff_t pos) | |
1da177e4 | 669 | { |
33dccbb0 | 670 | struct file *file = iocb->ki_filp; |
ab46d779 | 671 | struct tun_struct *tun = tun_get(file); |
631ab46b | 672 | ssize_t result; |
1da177e4 LT |
673 | |
674 | if (!tun) | |
675 | return -EBADFD; | |
676 | ||
677 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
678 | ||
6f26c9a7 | 679 | result = tun_get_user(tun, iv, iov_length(iv, count), |
33dccbb0 | 680 | file->f_flags & O_NONBLOCK); |
631ab46b EB |
681 | |
682 | tun_put(tun); | |
683 | return result; | |
1da177e4 LT |
684 | } |
685 | ||
1da177e4 LT |
686 | /* Put packet to the user space buffer */ |
687 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
688 | struct sk_buff *skb, | |
43b39dcd | 689 | const struct iovec *iv, int len) |
1da177e4 LT |
690 | { |
691 | struct tun_pi pi = { 0, skb->protocol }; | |
692 | ssize_t total = 0; | |
693 | ||
694 | if (!(tun->flags & TUN_NO_PI)) { | |
695 | if ((len -= sizeof(pi)) < 0) | |
696 | return -EINVAL; | |
697 | ||
698 | if (len < skb->len) { | |
699 | /* Packet will be striped */ | |
700 | pi.flags |= TUN_PKT_STRIP; | |
701 | } | |
6aa20a22 | 702 | |
43b39dcd | 703 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
704 | return -EFAULT; |
705 | total += sizeof(pi); | |
6aa20a22 | 706 | } |
1da177e4 | 707 | |
f43798c2 RR |
708 | if (tun->flags & TUN_VNET_HDR) { |
709 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
710 | if ((len -= sizeof(gso)) < 0) | |
711 | return -EINVAL; | |
712 | ||
713 | if (skb_is_gso(skb)) { | |
714 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
715 | ||
716 | /* This is a hint as to how much should be linear. */ | |
717 | gso.hdr_len = skb_headlen(skb); | |
718 | gso.gso_size = sinfo->gso_size; | |
719 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
720 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
721 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
722 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
723 | else | |
724 | BUG(); | |
725 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
726 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
727 | } else | |
728 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
729 | ||
730 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
731 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
732 | gso.csum_start = skb->csum_start - skb_headroom(skb); | |
733 | gso.csum_offset = skb->csum_offset; | |
734 | } /* else everything is zero */ | |
735 | ||
43b39dcd MT |
736 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
737 | sizeof(gso)))) | |
f43798c2 RR |
738 | return -EFAULT; |
739 | total += sizeof(gso); | |
740 | } | |
741 | ||
1da177e4 LT |
742 | len = min_t(int, skb->len, len); |
743 | ||
43b39dcd | 744 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
1da177e4 LT |
745 | total += len; |
746 | ||
09f75cd7 JG |
747 | tun->dev->stats.tx_packets++; |
748 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
749 | |
750 | return total; | |
751 | } | |
752 | ||
ee0b3e67 BP |
753 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
754 | unsigned long count, loff_t pos) | |
1da177e4 | 755 | { |
ee0b3e67 | 756 | struct file *file = iocb->ki_filp; |
b2430de3 EB |
757 | struct tun_file *tfile = file->private_data; |
758 | struct tun_struct *tun = __tun_get(tfile); | |
1da177e4 LT |
759 | DECLARE_WAITQUEUE(wait, current); |
760 | struct sk_buff *skb; | |
761 | ssize_t len, ret = 0; | |
762 | ||
763 | if (!tun) | |
764 | return -EBADFD; | |
765 | ||
766 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
767 | ||
52427c9d | 768 | len = iov_length(iv, count); |
631ab46b EB |
769 | if (len < 0) { |
770 | ret = -EINVAL; | |
771 | goto out; | |
772 | } | |
1da177e4 | 773 | |
c40af84a | 774 | add_wait_queue(&tun->socket.wait, &wait); |
1da177e4 | 775 | while (len) { |
1da177e4 LT |
776 | current->state = TASK_INTERRUPTIBLE; |
777 | ||
778 | /* Read frames from the queue */ | |
779 | if (!(skb=skb_dequeue(&tun->readq))) { | |
780 | if (file->f_flags & O_NONBLOCK) { | |
781 | ret = -EAGAIN; | |
782 | break; | |
783 | } | |
784 | if (signal_pending(current)) { | |
785 | ret = -ERESTARTSYS; | |
786 | break; | |
787 | } | |
c70f1829 EB |
788 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
789 | ret = -EIO; | |
790 | break; | |
791 | } | |
1da177e4 LT |
792 | |
793 | /* Nothing to read, let's sleep */ | |
794 | schedule(); | |
795 | continue; | |
796 | } | |
797 | netif_wake_queue(tun->dev); | |
798 | ||
43b39dcd | 799 | ret = tun_put_user(tun, skb, iv, len); |
f271b2cc MK |
800 | kfree_skb(skb); |
801 | break; | |
1da177e4 LT |
802 | } |
803 | ||
804 | current->state = TASK_RUNNING; | |
c40af84a | 805 | remove_wait_queue(&tun->socket.wait, &wait); |
1da177e4 | 806 | |
631ab46b EB |
807 | out: |
808 | tun_put(tun); | |
1da177e4 LT |
809 | return ret; |
810 | } | |
811 | ||
1da177e4 LT |
812 | static void tun_setup(struct net_device *dev) |
813 | { | |
814 | struct tun_struct *tun = netdev_priv(dev); | |
815 | ||
816 | skb_queue_head_init(&tun->readq); | |
1da177e4 LT |
817 | |
818 | tun->owner = -1; | |
8c644623 | 819 | tun->group = -1; |
1da177e4 | 820 | |
1da177e4 | 821 | dev->ethtool_ops = &tun_ethtool_ops; |
9c3fea6a | 822 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
823 | } |
824 | ||
f019a7a5 EB |
825 | /* Trivial set of netlink ops to allow deleting tun or tap |
826 | * device with netlink. | |
827 | */ | |
828 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
829 | { | |
830 | return -EINVAL; | |
831 | } | |
832 | ||
833 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
834 | .kind = DRV_NAME, | |
835 | .priv_size = sizeof(struct tun_struct), | |
836 | .setup = tun_setup, | |
837 | .validate = tun_validate, | |
838 | }; | |
839 | ||
33dccbb0 HX |
840 | static void tun_sock_write_space(struct sock *sk) |
841 | { | |
842 | struct tun_struct *tun; | |
843 | ||
844 | if (!sock_writeable(sk)) | |
845 | return; | |
846 | ||
847 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
848 | wake_up_interruptible_sync(sk->sk_sleep); | |
849 | ||
850 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) | |
851 | return; | |
852 | ||
853 | tun = container_of(sk, struct tun_sock, sk)->tun; | |
854 | kill_fasync(&tun->fasync, SIGIO, POLL_OUT); | |
855 | } | |
856 | ||
857 | static void tun_sock_destruct(struct sock *sk) | |
858 | { | |
9c3fea6a | 859 | free_netdev(container_of(sk, struct tun_sock, sk)->tun->dev); |
33dccbb0 HX |
860 | } |
861 | ||
862 | static struct proto tun_proto = { | |
863 | .name = "tun", | |
864 | .owner = THIS_MODULE, | |
865 | .obj_size = sizeof(struct tun_sock), | |
866 | }; | |
f019a7a5 | 867 | |
980c9e8c DW |
868 | static int tun_flags(struct tun_struct *tun) |
869 | { | |
870 | int flags = 0; | |
871 | ||
872 | if (tun->flags & TUN_TUN_DEV) | |
873 | flags |= IFF_TUN; | |
874 | else | |
875 | flags |= IFF_TAP; | |
876 | ||
877 | if (tun->flags & TUN_NO_PI) | |
878 | flags |= IFF_NO_PI; | |
879 | ||
880 | if (tun->flags & TUN_ONE_QUEUE) | |
881 | flags |= IFF_ONE_QUEUE; | |
882 | ||
883 | if (tun->flags & TUN_VNET_HDR) | |
884 | flags |= IFF_VNET_HDR; | |
885 | ||
886 | return flags; | |
887 | } | |
888 | ||
889 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
890 | char *buf) | |
891 | { | |
892 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
893 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
894 | } | |
895 | ||
896 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
897 | char *buf) | |
898 | { | |
899 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
900 | return sprintf(buf, "%d\n", tun->owner); | |
901 | } | |
902 | ||
903 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
904 | char *buf) | |
905 | { | |
906 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
907 | return sprintf(buf, "%d\n", tun->group); | |
908 | } | |
909 | ||
910 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
911 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
912 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
913 | ||
d647a591 | 914 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 915 | { |
33dccbb0 | 916 | struct sock *sk; |
1da177e4 LT |
917 | struct tun_struct *tun; |
918 | struct net_device *dev; | |
919 | int err; | |
920 | ||
74a3e5a7 EB |
921 | dev = __dev_get_by_name(net, ifr->ifr_name); |
922 | if (dev) { | |
f85ba780 DW |
923 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
924 | return -EBUSY; | |
74a3e5a7 EB |
925 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
926 | tun = netdev_priv(dev); | |
927 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
928 | tun = netdev_priv(dev); | |
929 | else | |
930 | return -EINVAL; | |
931 | ||
a7385ba2 EB |
932 | err = tun_attach(tun, file); |
933 | if (err < 0) | |
934 | return err; | |
6aa20a22 | 935 | } |
1da177e4 LT |
936 | else { |
937 | char *name; | |
938 | unsigned long flags = 0; | |
939 | ||
940 | err = -EINVAL; | |
941 | ||
ca6bb5d7 DW |
942 | if (!capable(CAP_NET_ADMIN)) |
943 | return -EPERM; | |
944 | ||
1da177e4 LT |
945 | /* Set dev type */ |
946 | if (ifr->ifr_flags & IFF_TUN) { | |
947 | /* TUN device */ | |
948 | flags |= TUN_TUN_DEV; | |
949 | name = "tun%d"; | |
950 | } else if (ifr->ifr_flags & IFF_TAP) { | |
951 | /* TAP device */ | |
952 | flags |= TUN_TAP_DEV; | |
953 | name = "tap%d"; | |
6aa20a22 | 954 | } else |
1da177e4 | 955 | goto failed; |
6aa20a22 | 956 | |
1da177e4 LT |
957 | if (*ifr->ifr_name) |
958 | name = ifr->ifr_name; | |
959 | ||
960 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
961 | tun_setup); | |
962 | if (!dev) | |
963 | return -ENOMEM; | |
964 | ||
fc54c658 | 965 | dev_net_set(dev, net); |
f019a7a5 | 966 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 967 | |
1da177e4 LT |
968 | tun = netdev_priv(dev); |
969 | tun->dev = dev; | |
970 | tun->flags = flags; | |
f271b2cc | 971 | tun->txflt.count = 0; |
1da177e4 | 972 | |
33dccbb0 HX |
973 | err = -ENOMEM; |
974 | sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto); | |
975 | if (!sk) | |
976 | goto err_free_dev; | |
977 | ||
c40af84a | 978 | init_waitqueue_head(&tun->socket.wait); |
33dccbb0 HX |
979 | sock_init_data(&tun->socket, sk); |
980 | sk->sk_write_space = tun_sock_write_space; | |
33dccbb0 | 981 | sk->sk_sndbuf = INT_MAX; |
33dccbb0 HX |
982 | |
983 | tun->sk = sk; | |
984 | container_of(sk, struct tun_sock, sk)->tun = tun; | |
985 | ||
1da177e4 LT |
986 | tun_net_init(dev); |
987 | ||
988 | if (strchr(dev->name, '%')) { | |
989 | err = dev_alloc_name(dev, dev->name); | |
990 | if (err < 0) | |
33dccbb0 | 991 | goto err_free_sk; |
1da177e4 LT |
992 | } |
993 | ||
33dccbb0 | 994 | err = -EINVAL; |
1da177e4 LT |
995 | err = register_netdevice(tun->dev); |
996 | if (err < 0) | |
9c3fea6a HX |
997 | goto err_free_sk; |
998 | ||
980c9e8c DW |
999 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1000 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1001 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
1002 | printk(KERN_ERR "Failed to create tun sysfs files\n"); | |
1003 | ||
9c3fea6a | 1004 | sk->sk_destruct = tun_sock_destruct; |
a7385ba2 EB |
1005 | |
1006 | err = tun_attach(tun, file); | |
1007 | if (err < 0) | |
9c3fea6a | 1008 | goto failed; |
1da177e4 LT |
1009 | } |
1010 | ||
1011 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
1012 | ||
1013 | if (ifr->ifr_flags & IFF_NO_PI) | |
1014 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1015 | else |
1016 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
1017 | |
1018 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
1019 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1020 | else |
1021 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1022 | |
f43798c2 RR |
1023 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1024 | tun->flags |= TUN_VNET_HDR; | |
1025 | else | |
1026 | tun->flags &= ~TUN_VNET_HDR; | |
1027 | ||
e35259a9 MK |
1028 | /* Make sure persistent devices do not get stuck in |
1029 | * xoff state. | |
1030 | */ | |
1031 | if (netif_running(tun->dev)) | |
1032 | netif_wake_queue(tun->dev); | |
1033 | ||
1da177e4 LT |
1034 | strcpy(ifr->ifr_name, tun->dev->name); |
1035 | return 0; | |
1036 | ||
33dccbb0 HX |
1037 | err_free_sk: |
1038 | sock_put(sk); | |
1da177e4 LT |
1039 | err_free_dev: |
1040 | free_netdev(dev); | |
1041 | failed: | |
1042 | return err; | |
1043 | } | |
1044 | ||
e3b99556 MM |
1045 | static int tun_get_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1046 | { | |
631ab46b | 1047 | struct tun_struct *tun = tun_get(file); |
e3b99556 MM |
1048 | |
1049 | if (!tun) | |
1050 | return -EBADFD; | |
1051 | ||
1052 | DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name); | |
1053 | ||
1054 | strcpy(ifr->ifr_name, tun->dev->name); | |
1055 | ||
980c9e8c | 1056 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 1057 | |
631ab46b | 1058 | tun_put(tun); |
e3b99556 MM |
1059 | return 0; |
1060 | } | |
1061 | ||
5228ddc9 RR |
1062 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1063 | * privs required. */ | |
1064 | static int set_offload(struct net_device *dev, unsigned long arg) | |
1065 | { | |
1066 | unsigned int old_features, features; | |
1067 | ||
1068 | old_features = dev->features; | |
1069 | /* Unset features, set them as we chew on the arg. */ | |
1070 | features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST | |
1071 | |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6)); | |
1072 | ||
1073 | if (arg & TUN_F_CSUM) { | |
1074 | features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1075 | arg &= ~TUN_F_CSUM; | |
1076 | ||
1077 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1078 | if (arg & TUN_F_TSO_ECN) { | |
1079 | features |= NETIF_F_TSO_ECN; | |
1080 | arg &= ~TUN_F_TSO_ECN; | |
1081 | } | |
1082 | if (arg & TUN_F_TSO4) | |
1083 | features |= NETIF_F_TSO; | |
1084 | if (arg & TUN_F_TSO6) | |
1085 | features |= NETIF_F_TSO6; | |
1086 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | /* This gives the user a way to test for new features in future by | |
1091 | * trying to set them. */ | |
1092 | if (arg) | |
1093 | return -EINVAL; | |
1094 | ||
1095 | dev->features = features; | |
1096 | if (old_features != dev->features) | |
1097 | netdev_features_change(dev); | |
1098 | ||
1099 | return 0; | |
1100 | } | |
1101 | ||
6aa20a22 | 1102 | static int tun_chr_ioctl(struct inode *inode, struct file *file, |
1da177e4 LT |
1103 | unsigned int cmd, unsigned long arg) |
1104 | { | |
36b50bab | 1105 | struct tun_file *tfile = file->private_data; |
631ab46b | 1106 | struct tun_struct *tun; |
1da177e4 LT |
1107 | void __user* argp = (void __user*)arg; |
1108 | struct ifreq ifr; | |
33dccbb0 | 1109 | int sndbuf; |
f271b2cc | 1110 | int ret; |
1da177e4 LT |
1111 | |
1112 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
1113 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
1114 | return -EFAULT; | |
1115 | ||
631ab46b EB |
1116 | if (cmd == TUNGETFEATURES) { |
1117 | /* Currently this just means: "what IFF flags are valid?". | |
1118 | * This is needed because we never checked for invalid flags on | |
1119 | * TUNSETIFF. */ | |
1120 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
1121 | IFF_VNET_HDR, | |
1122 | (unsigned int __user*)argp); | |
1123 | } | |
1124 | ||
36b50bab | 1125 | tun = __tun_get(tfile); |
1da177e4 LT |
1126 | if (cmd == TUNSETIFF && !tun) { |
1127 | int err; | |
1128 | ||
1129 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
1130 | ||
1131 | rtnl_lock(); | |
36b50bab | 1132 | err = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 LT |
1133 | rtnl_unlock(); |
1134 | ||
1135 | if (err) | |
1136 | return err; | |
1137 | ||
1138 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
1139 | return -EFAULT; | |
1140 | return 0; | |
1141 | } | |
1142 | ||
07240fd0 | 1143 | |
1da177e4 LT |
1144 | if (!tun) |
1145 | return -EBADFD; | |
1146 | ||
1147 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
1148 | ||
631ab46b | 1149 | ret = 0; |
1da177e4 | 1150 | switch (cmd) { |
e3b99556 MM |
1151 | case TUNGETIFF: |
1152 | ret = tun_get_iff(current->nsproxy->net_ns, file, &ifr); | |
1153 | if (ret) | |
631ab46b | 1154 | break; |
e3b99556 MM |
1155 | |
1156 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
631ab46b | 1157 | ret = -EFAULT; |
e3b99556 MM |
1158 | break; |
1159 | ||
1da177e4 LT |
1160 | case TUNSETNOCSUM: |
1161 | /* Disable/Enable checksum */ | |
1162 | if (arg) | |
1163 | tun->flags |= TUN_NOCHECKSUM; | |
1164 | else | |
1165 | tun->flags &= ~TUN_NOCHECKSUM; | |
1166 | ||
1167 | DBG(KERN_INFO "%s: checksum %s\n", | |
1168 | tun->dev->name, arg ? "disabled" : "enabled"); | |
1169 | break; | |
1170 | ||
1171 | case TUNSETPERSIST: | |
1172 | /* Disable/Enable persist mode */ | |
1173 | if (arg) | |
1174 | tun->flags |= TUN_PERSIST; | |
1175 | else | |
1176 | tun->flags &= ~TUN_PERSIST; | |
1177 | ||
1178 | DBG(KERN_INFO "%s: persist %s\n", | |
c6e991de | 1179 | tun->dev->name, arg ? "enabled" : "disabled"); |
1da177e4 LT |
1180 | break; |
1181 | ||
1182 | case TUNSETOWNER: | |
1183 | /* Set owner of the device */ | |
1184 | tun->owner = (uid_t) arg; | |
1185 | ||
1186 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
1187 | break; | |
1188 | ||
8c644623 GG |
1189 | case TUNSETGROUP: |
1190 | /* Set group of the device */ | |
1191 | tun->group= (gid_t) arg; | |
1192 | ||
1193 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
1194 | break; | |
1195 | ||
ff4cc3ac MK |
1196 | case TUNSETLINK: |
1197 | /* Only allow setting the type when the interface is down */ | |
48abfe05 | 1198 | rtnl_lock(); |
ff4cc3ac MK |
1199 | if (tun->dev->flags & IFF_UP) { |
1200 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
1201 | tun->dev->name); | |
48abfe05 | 1202 | ret = -EBUSY; |
ff4cc3ac MK |
1203 | } else { |
1204 | tun->dev->type = (int) arg; | |
1205 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
48abfe05 | 1206 | ret = 0; |
ff4cc3ac | 1207 | } |
48abfe05 | 1208 | rtnl_unlock(); |
631ab46b | 1209 | break; |
ff4cc3ac | 1210 | |
1da177e4 LT |
1211 | #ifdef TUN_DEBUG |
1212 | case TUNSETDEBUG: | |
1213 | tun->debug = arg; | |
1214 | break; | |
1215 | #endif | |
5228ddc9 | 1216 | case TUNSETOFFLOAD: |
5228ddc9 RR |
1217 | rtnl_lock(); |
1218 | ret = set_offload(tun->dev, arg); | |
1219 | rtnl_unlock(); | |
631ab46b | 1220 | break; |
5228ddc9 | 1221 | |
f271b2cc MK |
1222 | case TUNSETTXFILTER: |
1223 | /* Can be set only for TAPs */ | |
631ab46b | 1224 | ret = -EINVAL; |
f271b2cc | 1225 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 1226 | break; |
f271b2cc | 1227 | rtnl_lock(); |
c0e5a8c2 | 1228 | ret = update_filter(&tun->txflt, (void __user *)arg); |
f271b2cc | 1229 | rtnl_unlock(); |
631ab46b | 1230 | break; |
1da177e4 LT |
1231 | |
1232 | case SIOCGIFHWADDR: | |
f271b2cc MK |
1233 | /* Get hw addres */ |
1234 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); | |
1235 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
1236 | if (copy_to_user(argp, &ifr, sizeof ifr)) | |
631ab46b EB |
1237 | ret = -EFAULT; |
1238 | break; | |
1da177e4 LT |
1239 | |
1240 | case SIOCSIFHWADDR: | |
f271b2cc | 1241 | /* Set hw address */ |
e174961c JB |
1242 | DBG(KERN_DEBUG "%s: set hw address: %pM\n", |
1243 | tun->dev->name, ifr.ifr_hwaddr.sa_data); | |
40102371 KH |
1244 | |
1245 | rtnl_lock(); | |
1246 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); | |
1247 | rtnl_unlock(); | |
631ab46b | 1248 | break; |
33dccbb0 HX |
1249 | |
1250 | case TUNGETSNDBUF: | |
1251 | sndbuf = tun->sk->sk_sndbuf; | |
1252 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) | |
1253 | ret = -EFAULT; | |
1254 | break; | |
1255 | ||
1256 | case TUNSETSNDBUF: | |
1257 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
1258 | ret = -EFAULT; | |
1259 | break; | |
1260 | } | |
1261 | ||
1262 | tun->sk->sk_sndbuf = sndbuf; | |
1263 | break; | |
1264 | ||
1da177e4 | 1265 | default: |
631ab46b EB |
1266 | ret = -EINVAL; |
1267 | break; | |
1da177e4 LT |
1268 | }; |
1269 | ||
631ab46b EB |
1270 | tun_put(tun); |
1271 | return ret; | |
1da177e4 LT |
1272 | } |
1273 | ||
1274 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
1275 | { | |
631ab46b | 1276 | struct tun_struct *tun = tun_get(file); |
1da177e4 LT |
1277 | int ret; |
1278 | ||
1279 | if (!tun) | |
1280 | return -EBADFD; | |
1281 | ||
1282 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
1283 | ||
9d319522 | 1284 | lock_kernel(); |
1da177e4 | 1285 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) |
9d319522 | 1286 | goto out; |
6aa20a22 | 1287 | |
1da177e4 | 1288 | if (on) { |
609d7fa9 | 1289 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 1290 | if (ret) |
9d319522 | 1291 | goto out; |
1da177e4 | 1292 | tun->flags |= TUN_FASYNC; |
6aa20a22 | 1293 | } else |
1da177e4 | 1294 | tun->flags &= ~TUN_FASYNC; |
9d319522 JC |
1295 | ret = 0; |
1296 | out: | |
1297 | unlock_kernel(); | |
631ab46b | 1298 | tun_put(tun); |
9d319522 | 1299 | return ret; |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | static int tun_chr_open(struct inode *inode, struct file * file) | |
1303 | { | |
631ab46b | 1304 | struct tun_file *tfile; |
fd3e05b6 | 1305 | cycle_kernel_lock(); |
1da177e4 | 1306 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); |
631ab46b EB |
1307 | |
1308 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); | |
1309 | if (!tfile) | |
1310 | return -ENOMEM; | |
c70f1829 | 1311 | atomic_set(&tfile->count, 0); |
631ab46b | 1312 | tfile->tun = NULL; |
36b50bab | 1313 | tfile->net = get_net(current->nsproxy->net_ns); |
631ab46b | 1314 | file->private_data = tfile; |
1da177e4 LT |
1315 | return 0; |
1316 | } | |
1317 | ||
1318 | static int tun_chr_close(struct inode *inode, struct file *file) | |
1319 | { | |
631ab46b EB |
1320 | struct tun_file *tfile = file->private_data; |
1321 | struct tun_struct *tun = __tun_get(tfile); | |
1da177e4 | 1322 | |
1da177e4 | 1323 | |
631ab46b EB |
1324 | if (tun) { |
1325 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
1da177e4 | 1326 | |
631ab46b EB |
1327 | rtnl_lock(); |
1328 | __tun_detach(tun); | |
1da177e4 | 1329 | |
631ab46b | 1330 | /* If desireable, unregister the netdevice. */ |
9c3fea6a | 1331 | if (!(tun->flags & TUN_PERSIST)) |
631ab46b | 1332 | unregister_netdevice(tun->dev); |
1da177e4 | 1333 | |
631ab46b EB |
1334 | rtnl_unlock(); |
1335 | } | |
1da177e4 | 1336 | |
9c3fea6a HX |
1337 | tun = tfile->tun; |
1338 | if (tun) | |
1339 | sock_put(tun->sk); | |
1340 | ||
36b50bab | 1341 | put_net(tfile->net); |
631ab46b | 1342 | kfree(tfile); |
1da177e4 LT |
1343 | |
1344 | return 0; | |
1345 | } | |
1346 | ||
d54b1fdb | 1347 | static const struct file_operations tun_fops = { |
6aa20a22 | 1348 | .owner = THIS_MODULE, |
1da177e4 | 1349 | .llseek = no_llseek, |
ee0b3e67 BP |
1350 | .read = do_sync_read, |
1351 | .aio_read = tun_chr_aio_read, | |
1352 | .write = do_sync_write, | |
1353 | .aio_write = tun_chr_aio_write, | |
1da177e4 LT |
1354 | .poll = tun_chr_poll, |
1355 | .ioctl = tun_chr_ioctl, | |
1356 | .open = tun_chr_open, | |
1357 | .release = tun_chr_close, | |
6aa20a22 | 1358 | .fasync = tun_chr_fasync |
1da177e4 LT |
1359 | }; |
1360 | ||
1361 | static struct miscdevice tun_miscdev = { | |
1362 | .minor = TUN_MINOR, | |
1363 | .name = "tun", | |
1364 | .fops = &tun_fops, | |
1da177e4 LT |
1365 | }; |
1366 | ||
1367 | /* ethtool interface */ | |
1368 | ||
1369 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1370 | { | |
1371 | cmd->supported = 0; | |
1372 | cmd->advertising = 0; | |
1373 | cmd->speed = SPEED_10; | |
1374 | cmd->duplex = DUPLEX_FULL; | |
1375 | cmd->port = PORT_TP; | |
1376 | cmd->phy_address = 0; | |
1377 | cmd->transceiver = XCVR_INTERNAL; | |
1378 | cmd->autoneg = AUTONEG_DISABLE; | |
1379 | cmd->maxtxpkt = 0; | |
1380 | cmd->maxrxpkt = 0; | |
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
1385 | { | |
1386 | struct tun_struct *tun = netdev_priv(dev); | |
1387 | ||
1388 | strcpy(info->driver, DRV_NAME); | |
1389 | strcpy(info->version, DRV_VERSION); | |
1390 | strcpy(info->fw_version, "N/A"); | |
1391 | ||
1392 | switch (tun->flags & TUN_TYPE_MASK) { | |
1393 | case TUN_TUN_DEV: | |
1394 | strcpy(info->bus_info, "tun"); | |
1395 | break; | |
1396 | case TUN_TAP_DEV: | |
1397 | strcpy(info->bus_info, "tap"); | |
1398 | break; | |
1399 | } | |
1400 | } | |
1401 | ||
1402 | static u32 tun_get_msglevel(struct net_device *dev) | |
1403 | { | |
1404 | #ifdef TUN_DEBUG | |
1405 | struct tun_struct *tun = netdev_priv(dev); | |
1406 | return tun->debug; | |
1407 | #else | |
1408 | return -EOPNOTSUPP; | |
1409 | #endif | |
1410 | } | |
1411 | ||
1412 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
1413 | { | |
1414 | #ifdef TUN_DEBUG | |
1415 | struct tun_struct *tun = netdev_priv(dev); | |
1416 | tun->debug = value; | |
1417 | #endif | |
1418 | } | |
1419 | ||
1420 | static u32 tun_get_link(struct net_device *dev) | |
1421 | { | |
1422 | struct tun_struct *tun = netdev_priv(dev); | |
631ab46b | 1423 | return !!tun->tfile; |
1da177e4 LT |
1424 | } |
1425 | ||
1426 | static u32 tun_get_rx_csum(struct net_device *dev) | |
1427 | { | |
1428 | struct tun_struct *tun = netdev_priv(dev); | |
1429 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
1430 | } | |
1431 | ||
1432 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
1433 | { | |
1434 | struct tun_struct *tun = netdev_priv(dev); | |
1435 | if (data) | |
1436 | tun->flags &= ~TUN_NOCHECKSUM; | |
1437 | else | |
1438 | tun->flags |= TUN_NOCHECKSUM; | |
1439 | return 0; | |
1440 | } | |
1441 | ||
7282d491 | 1442 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
1443 | .get_settings = tun_get_settings, |
1444 | .get_drvinfo = tun_get_drvinfo, | |
1445 | .get_msglevel = tun_get_msglevel, | |
1446 | .set_msglevel = tun_set_msglevel, | |
1447 | .get_link = tun_get_link, | |
1448 | .get_rx_csum = tun_get_rx_csum, | |
1449 | .set_rx_csum = tun_set_rx_csum | |
1450 | }; | |
1451 | ||
79d17604 | 1452 | |
1da177e4 LT |
1453 | static int __init tun_init(void) |
1454 | { | |
1455 | int ret = 0; | |
1456 | ||
1457 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
1458 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
1459 | ||
f019a7a5 | 1460 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 1461 | if (ret) { |
f019a7a5 EB |
1462 | printk(KERN_ERR "tun: Can't register link_ops\n"); |
1463 | goto err_linkops; | |
79d17604 PE |
1464 | } |
1465 | ||
1da177e4 | 1466 | ret = misc_register(&tun_miscdev); |
79d17604 | 1467 | if (ret) { |
1da177e4 | 1468 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1469 | goto err_misc; |
1470 | } | |
f019a7a5 | 1471 | return 0; |
79d17604 | 1472 | err_misc: |
f019a7a5 EB |
1473 | rtnl_link_unregister(&tun_link_ops); |
1474 | err_linkops: | |
1da177e4 LT |
1475 | return ret; |
1476 | } | |
1477 | ||
1478 | static void tun_cleanup(void) | |
1479 | { | |
6aa20a22 | 1480 | misc_deregister(&tun_miscdev); |
f019a7a5 | 1481 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
1482 | } |
1483 | ||
1484 | module_init(tun_init); | |
1485 | module_exit(tun_cleanup); | |
1486 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1487 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1488 | MODULE_LICENSE("GPL"); | |
1489 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |